I just bought my S/S springs for my '63 330, MP 3400#. They seem to match segment length of the original set removed, so I assume I can use the original front hanger brackets from the car ? I also bought the recommended extended brackets, P4120080, but these should be used on '64-'65 only ? Just looking for confirmation from those of you who have used this set up, so I clean, prep, and paint the right parts to go in. Thanks for your input...